"You've told me this before and it blows my mind, that it's all trash-talk and they pretend to hate each other..." co-host Fifi Box followed up.

"Yes, and they make a fortune because they just box each other again and again and again," said Fevola.

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Anthony Mundine on I'm a Celebrity.Credit:Ten

The boxers – who squared off in 2006, with Mundine winning by unanimous decision in a bout that broke Aussie pay-per-view records, and again last February in a controversial rematch claimed by Green (both fighters have hinted at a potential third to be held in Green's Perth hometown) – have regularly traded insults in the media.

Ten have played on that supposed animosity in promos, pitching their jungle meeting – which is set to debut on Sunday's episode – as "two celebrities in the middle of Australia's biggest feud".

Early promos also suggested "fire is likely to ignite between the argumentative duo" during their time on the series.

But Fevola says the pair are close, and recalled seeing them on friendly terms at a hotel in Carlton about "10 years ago".

Danny Green gets welcomed by host Julia Morris.Credit:Ten

"Choc was fighting, and I was in his hotel room to get some tickets," he said.

"We were sitting on the couch having a good chat about footy and rugby when there's a knock on the door.

Brendan Fevola won the series in 2016.Credit:Jodie Stephens

"I thought, 'Oh here's someone else to pick up some free tickets...'. But Anthony opened the door and in walked Danny Green and Danny Green's wife."

The AFL star said he thought an impromptu punch-up was on the cards, 'cause he knew "these guys hate each other".

Danny Green v Anthony Mundine in 2006.

"But then [Green] sits down. 'G'day Choc. G'day Danny. How you going?', give each other cuddles, gives his wife a kiss, [Mundine] signs his book for him, gave him tickets... I'm going, what the hell's going on here?" said Fevola.

"When he walks out, [Mundine] goes 'Oh no, we're mates.' Sorry, what? That just wrecked it all for me," he said.